udev: rework 60-evdev.rules to be "additive"

We would execute up to four hwdb match patterns (+ the keyboard builtin):
After the first hit, we would skip the other patterns, because of the GOTO="evdev_end"
action.

57bb707d48131f4daad2b1b746eab586eb66b4f3 (rules: Add extended evdev/input match
rules for event nodes with the same name), added an additional match with
":phys:<phys>:ev:<ev>" inserted. This breaks backwards compatibility for user
hwdb patterns, because we quit after the first match.

In general hwdb properties are "additive". We often have a general rule that
matches a wider class and then some specific overrides. E.g. in this particular
case, we have a match for all trackpoints, and then a bunch of model-specific
settings.

So let's change the rules to try all the match patterns and combine the
received properties. We execute builtin-keyboard once at the end, if there was
at least one match.

Fixes #25698. Fixes https://bugzilla.redhat.com/show_bug.cgi?id=2152226.

This also impacts other cases which I think would be very confusing for users.
Since we quit after a first successful match, if we had e.g. a match for
'evdev:input:b*v*p*' in out database, and the user added a match using
'evdev:name:*', which is the approach we document in the .hwdb files and which
users quite often use, it would be silently ignored. What's worse, if we added
our 'evdev:input:b*v*p*' match at a later point, user's match would stop
working. If we combine all the properties, we get more stable behaviour.

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